91045505 has 4 divisors (see below), whose sum is σ = 109254612. Its totient is φ = 72836400.

The previous prime is 91045499. The next prime is 91045517. The reversal of 91045505 is 50554019.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59043856 + 32001649 = 7684^2 + 5657^2 .

It is not a de Polignac number, because 91045505 - 2⁶ = 91045441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9104546 + ... + 9104555.

It is an arithmetic number, because the mean of its divisors is an integer number (27313653).

Almost surely, 2^91045505 is an apocalyptic number.

It is an amenable number.

91045505 is a deficient number, since it is larger than the sum of its proper divisors (18209107).

91045505 is a wasteful number, since it uses less digits than its factorization.

91045505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18209106.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 91045505 is about 9541.7768261472. The cubic root of 91045505 is about 449.8691059627.

It can be divided in two parts, 910 and 45505, that multiplied together give a triangular number (41409550 = T₉₁₀₀).

The spelling of 91045505 in words is "ninety-one million, forty-five thousand, five hundred five".